Source : Webster's Revised Unabridged Dictionary (1913)

Quit \Quit\, v. t. [imp. & p. p. {Quit} or {Quitted}; p. pr. &
   vb. n. {Quitting}.] [OE. quiten, OF. quiter, quitier,
   cuitier, F. quitter, to acquit, quit, LL. quietare, fr. L.
   quietare to calm, to quiet, fr. quietus quiet. See {Quiet},
   a., and cf. {Quit}, a., {Quite}, {Acquit}, {Requite}.]
   1. To set at rest; to free, as from anything harmful or
      oppressive; to relieve; to clear; to liberate. [R.]

            To quit you of this fear, you have already looked
            Death in the face; what have you found so terrible
            in it?                                --Wake.

   2. To release from obligation, accusation, penalty, or the
      like; to absolve; to acquit.

            There may no gold them quyte.         --Chaucer.

            God will relent, and quit thee all his debt.
                                                  --Milton.

   3. To discharge, as an obligation or duty; to meet and
      satisfy, as a claim or debt; to make payment for or of; to
      requite; to repay.

            The blissful martyr quyte you your meed. --Chaucer.

            Enkindle all the sparks of nature To quit this
            horrid act.                           --Shak.

            Before that judge that quits each soul his hire.
                                                  --Fairfax.

   4. To meet the claims upon, or expectations entertained of;
      to conduct; to acquit; -- used reflexively.

            Be strong, and quit yourselves like men. --I Sam.
                                                  iv. 9.

            Samson hath guit himself Like Samson. --Milton.

   5. To carry through; to go through to the end. [Obs.]

            Never worthy prince a day did quit With greater
            hazard and with more renown.          --Daniel.

   6. To have done with; to cease from; to stop; hence, to
      depart from; to leave; to forsake; as, to quit work; to
      quit the place; to quit jesting.

            Such a superficial way of examining is to quit truth
            for appearance.                       --Locke.

   {To quit cost}, to pay; to reimburse.

   {To quit scores}, to make even; to clear mutually from
      demands.

            Does not the earth quit scores with all the elements
            in the noble fruits that issue from it? --South.

   Syn: To leave; relinquish; resign; abandon; forsake;
        surrender; discharge; requite.

   Usage: {Quit}, {Leave}. Leave is a general term, signifying
          merely an act of departure; quit implies a going
          without intention of return, a final and absolute
          abandonment.

Source : WordNet®

quit
     v 1: put an end to a state or an activity; "Quit teasing your
          little brother" [syn: {discontinue}, {stop}, {cease}, {give
          up}, {lay off}] [ant: {continue}]
     2: give up or retire from a position; "The Secretary fo the
        Navy will leave office next month"; "The chairman resigned
        over the financial scandal" [syn: {leave office}, {step
        down}, {resign}] [ant: {take office}]
     3: go away or leave [syn: {depart}, {take leave}] [ant: {stay}]
     4: turn away from; give up; "I am foreswearing women forever"
        [syn: {foreswear}, {renounce}, {relinquish}]
     5: give up in the face of defeat of lacking hope; admit defeat;
        "In the second round, the challenger gave up" [syn: {drop
        out}, {give up}, {fall by the wayside}, {drop by the
        wayside}, {throw in}, {throw in the towel}, {chuck up the
        sponge}] [ant: {enter}]
     [also: {quitting}, {quitted}]

quitted
     See {quit}